Overall Dimensions â High School. High School Overall football field dimensions are as follows: Length: 360 feet or 120 yards. Width: 160 feet or 53 1/3 yards. End Zone: High School end zones are 10 yards deep. End Line: A six foot end line border marks the back of the end zone. Field Numbers: Sideline field numbers are 6 foot high by 4 foot wide designating each 10 yard line marker.
1 On average, dogs have two cycles a year. 2  The estrus cycle lasts on average 12-21 days, but maybe be as short as a few days to four weeks. 3  The estrus period length varies widely between breeds and individual dogs. 4  The length of a cycle varies widely, even for dogs of the same breed.
So unless you want pups, keep your girl away from any intact males during this period. The average heat cycle for a dog is approximately 3 weeks and since this an an average, some heats are shorter (as little as 7-10 days), others are longer (4 weeks or more). <br /> <br /> Average times between heat periods is seven months but some dogs can cycle as early as every 4 months, some once a year.